package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

//自定义切面，实现公共部分字段的自动填充处理逻辑
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill))")
    public void autoFillPointCut() {

    }
    //前置通知，在同知之前执行公共字段的赋值
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行自动填充公共字段");
        //获取当前被拦截的方法的数据库的操作类型
        //获取方法签名对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //获取方法上的注解对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        //获取数据库操作类型
        OperationType operationType = autoFill.value();
        //获取当前被拦截的方法的参数,实体对象

        Object[] args = joinPoint.getArgs();
        if (args.length == 0) {
            return;
        }
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据数据库的操作类型和参数列表进行公共字段的赋值
        if(operationType == OperationType.INSERT) {
            //新增操作
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, Long.class);
                //通过反射来给对象的属性进行赋值
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        } else if (operationType == OperationType.UPDATE) {
            //修改操作
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, Long.class);
                //通过反射来给对象的属性进行赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }
}
